An example to analyze the influence of improper process design on post-press processing
case study Case 1: In July 2004, our factory undertook the book "Calligraphy Art", which is 16 degrees positive, 5.625 printed pages, 70g / m2 double offset paper, 8-color printing on both sides, 300,000 copies, wireless binding. The book has been arranged by the publishing house, and the film is directly provided to our factory. It was found during the imposition that the job had problems in process design: if 0.5 printed sheets are in the penultimate post, and a single page of 0.125 printed sheets is placed on Last post. Considering that when the book is bound, the single page of 0.125 printed sheets is prone to problems such as page dropping, shrinking, skew, etc., we consulted with the publishing house and hoped to change the process design, either remove 0.125 printed sheets, or become 0.25 printed sheets, and the most Don't put it in the last post, but the publishing house failed to accept our factory's suggestion and insisted on the original process design plan repeatedly. In order to ensure the quality, we can only think of another way and take appropriate measures to avoid the above problems on the single page of 0.125 printed sheets. Our approach is to first stick a single page on a 0.5-print signature, and then bind the pages. But this not only wastes manpower and increases workload, but also has low production efficiency and difficult to guarantee the construction period. After seeing the homework scene at that time, the publishing house also realized that the original process design was unreasonable. So when the book was printed again in July 2005, the original 0.125 sheets were changed to 0.25 sheets. Case 2: In August 2005, our factory received the printing task of the high school textbook "Geography Atlas". The book is 16 degrees in size and the text is 4.75 printed sheets. It is printed on 8 sides of 80g / m2 double-sided offset paper. 120,000 volumes, saddle stitched. The publisher provides the film directly to our factory. The book has a globe icon at a distance of 3mm from the top and the front of the double-digit page number. From each single page or single printed sheet, the process design is completely correct, but it combines the characteristics of multiple printed sheets, thick paper, saddle stitching, There are still some problems with the craft design of the book. When cutting to the finished size, part of the earth icon on the middle page will be cut off; to ensure that the earth icon is not cut off, the front opening will be larger than the required size, and there may be phenomena that the outer book pages cannot be cut or connected . So we told the publishing house and relevant departments about the problem, but in order to guarantee the promise of "the book arrives before class, one manual", it is no longer possible to change the process design. This requires us to overcome difficulties and try our best to ensure that we do n’t cut out the earth icon, and try to avoid the phenomenon of uncut and continuous pages. In this way, the workload is also increased, the production efficiency is reduced, and the quality is not guaranteed. Through the above two case studies, combined with many years of practical experience, the author believes that a good process design scheme can not only ensure product quality, but also facilitate product production operations, improve production efficiency, and achieve a multiplier effect. Experience summary The author also summed up some experiences in the post-press work, and is willing to communicate with colleagues. Please criticize and correct the deficiencies. (1) When designing an imposition folding hand, strictly in accordance with the requirements of industry standards, paper up to 60g / m2 can be folded up to 4%, paper from 60 to 80g / m2 can be folded up to 3%, and paper above 80g / m2 can be folded up to 2%. When there are zero posts that are less than the entire printed sheet, the bound book will design the last post as a whole post, and all the zero posts will be placed in front of the last post to facilitate page collation, page collision, and book splitting operations. For saddle-stitched books, the zero post should be placed on the outer post, and the smallest zero post should be placed on the outermost post, which is easy to open when binding and prevent missed orders. (2) When there are zero-posts that need to be assembled, a few more sets should be made according to the needs, and they should be assembled into a large version. Try to avoid continuous exposure to reduce the difficulty and workload of printing. (3) In the process design, the production process involved should be integrated according to the requirements of live parts, and comprehensive consideration should be taken to prevent the loss of one another and affect the quality of post-printing processing of the product. Galvanized Gabion Box,Professional Welded Gabion,Hexagonal Gabion Netting,Pvc Coated Gabion Mesh Anping Chuangqian Wire Mesh Co., Ltd , https://www.apcqwiremesh.com